1 /*
2 * pcap-dag.c: Packet capture interface for Endace DAG cards.
3 *
4 * The functionality of this code attempts to mimic that of pcap-linux as much
5 * as possible. This code is compiled in several different ways depending on
6 * whether DAG_ONLY and HAVE_DAG_API are defined. If HAVE_DAG_API is not
7 * defined it should not get compiled in, otherwise if DAG_ONLY is defined then
8 * the 'dag_' function calls are renamed to 'pcap_' equivalents. If DAG_ONLY
9 * is not defined then nothing is altered - the dag_ functions will be
10 * called as required from their pcap-linux/bpf equivalents.
11 *
12 * Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com)
13 * Modifications: Jesper Peterson
14 * Koryn Grant
15 * Stephen Donnelly <stephen.donnelly@endace.com>
16 */
17
18 #ifdef HAVE_CONFIG_H
19 #include <config.h>
20 #endif
21
22 #include <sys/param.h> /* optionally get BSD define */
23
24 #include <stdlib.h>
25 #include <string.h>
26 #include <errno.h>
27
28 #include "pcap-int.h"
29
30 #include <ctype.h>
31 #include <netinet/in.h>
32 #include <sys/mman.h>
33 #include <sys/socket.h>
34 #include <sys/types.h>
35 #include <unistd.h>
36
37 struct mbuf; /* Squelch compiler warnings on some platforms for */
38 struct rtentry; /* declarations in <net/if.h> */
39 #include <net/if.h>
40
41 #include "dagnew.h"
42 #include "dagapi.h"
43 #include "dagpci.h"
44 #include "dag_config_api.h"
45
46 #include "pcap-dag.h"
47
48 /*
49 * DAG devices have names beginning with "dag", followed by a number
50 * from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number
51 * from 0 to DAG_STREAM_MAX.
52 */
53 #ifndef DAG_MAX_BOARDS
54 #define DAG_MAX_BOARDS 32
55 #endif
56
57
58 #ifndef ERF_TYPE_AAL5
59 #define ERF_TYPE_AAL5 4
60 #endif
61
62 #ifndef ERF_TYPE_MC_HDLC
63 #define ERF_TYPE_MC_HDLC 5
64 #endif
65
66 #ifndef ERF_TYPE_MC_RAW
67 #define ERF_TYPE_MC_RAW 6
68 #endif
69
70 #ifndef ERF_TYPE_MC_ATM
71 #define ERF_TYPE_MC_ATM 7
72 #endif
73
74 #ifndef ERF_TYPE_MC_RAW_CHANNEL
75 #define ERF_TYPE_MC_RAW_CHANNEL 8
76 #endif
77
78 #ifndef ERF_TYPE_MC_AAL5
79 #define ERF_TYPE_MC_AAL5 9
80 #endif
81
82 #ifndef ERF_TYPE_COLOR_HDLC_POS
83 #define ERF_TYPE_COLOR_HDLC_POS 10
84 #endif
85
86 #ifndef ERF_TYPE_COLOR_ETH
87 #define ERF_TYPE_COLOR_ETH 11
88 #endif
89
90 #ifndef ERF_TYPE_MC_AAL2
91 #define ERF_TYPE_MC_AAL2 12
92 #endif
93
94 #ifndef ERF_TYPE_IP_COUNTER
95 #define ERF_TYPE_IP_COUNTER 13
96 #endif
97
98 #ifndef ERF_TYPE_TCP_FLOW_COUNTER
99 #define ERF_TYPE_TCP_FLOW_COUNTER 14
100 #endif
101
102 #ifndef ERF_TYPE_DSM_COLOR_HDLC_POS
103 #define ERF_TYPE_DSM_COLOR_HDLC_POS 15
104 #endif
105
106 #ifndef ERF_TYPE_DSM_COLOR_ETH
107 #define ERF_TYPE_DSM_COLOR_ETH 16
108 #endif
109
110 #ifndef ERF_TYPE_COLOR_MC_HDLC_POS
111 #define ERF_TYPE_COLOR_MC_HDLC_POS 17
112 #endif
113
114 #ifndef ERF_TYPE_AAL2
115 #define ERF_TYPE_AAL2 18
116 #endif
117
118 #ifndef ERF_TYPE_COLOR_HASH_POS
119 #define ERF_TYPE_COLOR_HASH_POS 19
120 #endif
121
122 #ifndef ERF_TYPE_COLOR_HASH_ETH
123 #define ERF_TYPE_COLOR_HASH_ETH 20
124 #endif
125
126 #ifndef ERF_TYPE_INFINIBAND
127 #define ERF_TYPE_INFINIBAND 21
128 #endif
129
130 #ifndef ERF_TYPE_IPV4
131 #define ERF_TYPE_IPV4 22
132 #endif
133
134 #ifndef ERF_TYPE_IPV6
135 #define ERF_TYPE_IPV6 23
136 #endif
137
138 #ifndef ERF_TYPE_RAW_LINK
139 #define ERF_TYPE_RAW_LINK 24
140 #endif
141
142 #ifndef ERF_TYPE_INFINIBAND_LINK
143 #define ERF_TYPE_INFINIBAND_LINK 25
144 #endif
145
146 #ifndef ERF_TYPE_META
147 #define ERF_TYPE_META 27
148 #endif
149
150 #ifndef ERF_TYPE_PAD
151 #define ERF_TYPE_PAD 48
152 #endif
153
154 #define ATM_CELL_SIZE 52
155 #define ATM_HDR_SIZE 4
156
157 /*
158 * A header containing additional MTP information.
159 */
160 #define MTP2_SENT_OFFSET 0 /* 1 byte */
161 #define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */
162 #define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */
163 #define MTP2_HDR_LEN 4 /* length of the header */
164
165 #define MTP2_ANNEX_A_NOT_USED 0
166 #define MTP2_ANNEX_A_USED 1
167 #define MTP2_ANNEX_A_USED_UNKNOWN 2
168
169 /* SunATM pseudo header */
170 struct sunatm_hdr {
171 unsigned char flags; /* destination and traffic type */
172 unsigned char vpi; /* VPI */
173 unsigned short vci; /* VCI */
174 };
175
176 /*
177 * Private data for capturing on DAG devices.
178 */
179 struct pcap_dag {
180 struct pcap_stat stat;
181 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
182 u_char *dag_mem_top; /* DAG card current memory top pointer */
183 int dag_fcs_bits; /* Number of checksum bits from link layer */
184 int dag_flags; /* Flags */
185 int dag_stream; /* DAG stream number */
186 int dag_timeout; /* timeout specified to pcap_open_live.
187 * Same as in linux above, introduce
188 * generally? */
189 dag_card_ref_t dag_ref; /* DAG Configuration/Status API card reference */
190 dag_component_t dag_root; /* DAG CSAPI Root component */
191 attr_uuid_t drop_attr; /* DAG Stream Drop Attribute handle, if available */
192 struct timeval required_select_timeout;
193 /* Timeout caller must use in event loops */
194 };
195
196 typedef struct pcap_dag_node {
197 struct pcap_dag_node *next;
198 pcap_t *p;
199 pid_t pid;
200 } pcap_dag_node_t;
201
202 static pcap_dag_node_t *pcap_dags = NULL;
203 static int atexit_handler_installed = 0;
204 static const unsigned short endian_test_word = 0x0100;
205
206 #define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word))
207
208 #define MAX_DAG_PACKET 65536
209
210 static unsigned char TempPkt[MAX_DAG_PACKET];
211
212 #ifndef HAVE_DAG_LARGE_STREAMS_API
213 #define dag_attach_stream64(a, b, c, d) dag_attach_stream(a, b, c, d)
214 #define dag_get_stream_poll64(a, b, c, d, e) dag_get_stream_poll(a, b, c, d, e)
215 #define dag_set_stream_poll64(a, b, c, d, e) dag_set_stream_poll(a, b, c, d, e)
216 #define dag_size_t uint32_t
217 #endif
218
219 static int dag_setfilter(pcap_t *p, struct bpf_program *fp);
220 static int dag_stats(pcap_t *p, struct pcap_stat *ps);
221 static int dag_set_datalink(pcap_t *p, int dlt);
222 static int dag_get_datalink(pcap_t *p);
223 static int dag_setnonblock(pcap_t *p, int nonblock);
224
225 static void
delete_pcap_dag(pcap_t * p)226 delete_pcap_dag(pcap_t *p)
227 {
228 pcap_dag_node_t *curr = NULL, *prev = NULL;
229
230 for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) {
231 /* empty */
232 }
233
234 if (curr != NULL && curr->p == p) {
235 if (prev != NULL) {
236 prev->next = curr->next;
237 } else {
238 pcap_dags = curr->next;
239 }
240 }
241 }
242
243 /*
244 * Performs a graceful shutdown of the DAG card, frees dynamic memory held
245 * in the pcap_t structure, and closes the file descriptor for the DAG card.
246 */
247
248 static void
dag_platform_cleanup(pcap_t * p)249 dag_platform_cleanup(pcap_t *p)
250 {
251 struct pcap_dag *pd = p->priv;
252
253 if(dag_stop_stream(p->fd, pd->dag_stream) < 0)
254 fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
255
256 if(dag_detach_stream(p->fd, pd->dag_stream) < 0)
257 fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
258
259 if(pd->dag_ref != NULL) {
260 dag_config_dispose(pd->dag_ref);
261 p->fd = -1;
262 pd->dag_ref = NULL;
263 }
264 delete_pcap_dag(p);
265 pcap_cleanup_live_common(p);
266 /* Note: don't need to call close(p->fd) or dag_close(p->fd) as dag_config_dispose(pd->dag_ref) does this. */
267 }
268
269 static void
atexit_handler(void)270 atexit_handler(void)
271 {
272 while (pcap_dags != NULL) {
273 if (pcap_dags->pid == getpid()) {
274 if (pcap_dags->p != NULL)
275 dag_platform_cleanup(pcap_dags->p);
276 } else {
277 delete_pcap_dag(pcap_dags->p);
278 }
279 }
280 }
281
282 static int
new_pcap_dag(pcap_t * p)283 new_pcap_dag(pcap_t *p)
284 {
285 pcap_dag_node_t *node = NULL;
286
287 if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) {
288 return -1;
289 }
290
291 if (!atexit_handler_installed) {
292 atexit(atexit_handler);
293 atexit_handler_installed = 1;
294 }
295
296 node->next = pcap_dags;
297 node->p = p;
298 node->pid = getpid();
299
300 pcap_dags = node;
301
302 return 0;
303 }
304
305 static unsigned int
dag_erf_ext_header_count(uint8_t * erf,size_t len)306 dag_erf_ext_header_count(uint8_t * erf, size_t len)
307 {
308 uint32_t hdr_num = 0;
309 uint8_t hdr_type;
310
311 /* basic sanity checks */
312 if ( erf == NULL )
313 return 0;
314 if ( len < 16 )
315 return 0;
316
317 /* check if we have any extension headers */
318 if ( (erf[8] & 0x80) == 0x00 )
319 return 0;
320
321 /* loop over the extension headers */
322 do {
323
324 /* sanity check we have enough bytes */
325 if ( len < (24 + (hdr_num * 8)) )
326 return hdr_num;
327
328 /* get the header type */
329 hdr_type = erf[(16 + (hdr_num * 8))];
330 hdr_num++;
331
332 } while ( hdr_type & 0x80 );
333
334 return hdr_num;
335 }
336
337 /*
338 * Read at most max_packets from the capture stream and call the callback
339 * for each of them. Returns the number of packets handled, -1 if an
340 * error occured, or -2 if we were told to break out of the loop.
341 */
342 static int
dag_read(pcap_t * p,int cnt,pcap_handler callback,u_char * user)343 dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
344 {
345 struct pcap_dag *pd = p->priv;
346 unsigned int processed = 0;
347 unsigned int nonblocking = pd->dag_flags & DAGF_NONBLOCK;
348 unsigned int num_ext_hdr = 0;
349 unsigned int ticks_per_second;
350
351 /* Get the next bufferful of packets (if necessary). */
352 while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) {
353
354 /*
355 * Has "pcap_breakloop()" been called?
356 */
357 if (p->break_loop) {
358 /*
359 * Yes - clear the flag that indicates that
360 * it has, and return -2 to indicate that
361 * we were told to break out of the loop.
362 */
363 p->break_loop = 0;
364 return -2;
365 }
366
367 /* dag_advance_stream() will block (unless nonblock is called)
368 * until 64kB of data has accumulated.
369 * If to_ms is set, it will timeout before 64kB has accumulated.
370 * We wait for 64kB because processing a few packets at a time
371 * can cause problems at high packet rates (>200kpps) due
372 * to inefficiencies.
373 * This does mean if to_ms is not specified the capture may 'hang'
374 * for long periods if the data rate is extremely slow (<64kB/sec)
375 * If non-block is specified it will return immediately. The user
376 * is then responsible for efficiency.
377 */
378 if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) {
379 return -1;
380 }
381
382 if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
383 {
384 /* Pcap is configured to process only available packets, and there aren't any, return immediately. */
385 return 0;
386 }
387
388 if(!nonblocking &&
389 pd->dag_timeout &&
390 (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
391 {
392 /* Blocking mode, but timeout set and no data has arrived, return anyway.*/
393 return 0;
394 }
395
396 }
397
398 /* Process the packets. */
399 while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) {
400
401 unsigned short packet_len = 0;
402 int caplen = 0;
403 struct pcap_pkthdr pcap_header;
404
405 dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom);
406
407 u_char *dp = ((u_char *)header); /* + dag_record_size; */
408 unsigned short rlen;
409
410 /*
411 * Has "pcap_breakloop()" been called?
412 */
413 if (p->break_loop) {
414 /*
415 * Yes - clear the flag that indicates that
416 * it has, and return -2 to indicate that
417 * we were told to break out of the loop.
418 */
419 p->break_loop = 0;
420 return -2;
421 }
422
423 rlen = ntohs(header->rlen);
424 if (rlen < dag_record_size)
425 {
426 strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE);
427 return -1;
428 }
429 pd->dag_mem_bottom += rlen;
430
431 /* Count lost packets. */
432 switch((header->type & 0x7f)) {
433 /* in these types the color value overwrites the lctr */
434 case ERF_TYPE_COLOR_HDLC_POS:
435 case ERF_TYPE_COLOR_ETH:
436 case ERF_TYPE_DSM_COLOR_HDLC_POS:
437 case ERF_TYPE_DSM_COLOR_ETH:
438 case ERF_TYPE_COLOR_MC_HDLC_POS:
439 case ERF_TYPE_COLOR_HASH_ETH:
440 case ERF_TYPE_COLOR_HASH_POS:
441 break;
442
443 default:
444 if ( (pd->drop_attr == kNullAttributeUuid) && (header->lctr) ) {
445 pd->stat.ps_drop += ntohs(header->lctr);
446 }
447 }
448
449 if ((header->type & 0x7f) == ERF_TYPE_PAD) {
450 continue;
451 }
452
453 num_ext_hdr = dag_erf_ext_header_count(dp, rlen);
454
455 /* ERF encapsulation */
456 /* The Extensible Record Format is not dropped for this kind of encapsulation,
457 * and will be handled as a pseudo header by the decoding application.
458 * The information carried in the ERF header and in the optional subheader (if present)
459 * could be merged with the libpcap information, to offer a better decoding.
460 * The packet length is
461 * o the length of the packet on the link (header->wlen),
462 * o plus the length of the ERF header (dag_record_size), as the length of the
463 * pseudo header will be adjusted during the decoding,
464 * o plus the length of the optional subheader (if present).
465 *
466 * The capture length is header.rlen and the byte stuffing for alignment will be dropped
467 * if the capture length is greater than the packet length.
468 */
469 if (p->linktype == DLT_ERF) {
470 packet_len = ntohs(header->wlen) + dag_record_size;
471 caplen = rlen;
472 switch ((header->type & 0x7f)) {
473 case ERF_TYPE_MC_AAL5:
474 case ERF_TYPE_MC_ATM:
475 case ERF_TYPE_MC_HDLC:
476 case ERF_TYPE_MC_RAW_CHANNEL:
477 case ERF_TYPE_MC_RAW:
478 case ERF_TYPE_MC_AAL2:
479 case ERF_TYPE_COLOR_MC_HDLC_POS:
480 packet_len += 4; /* MC header */
481 break;
482
483 case ERF_TYPE_COLOR_HASH_ETH:
484 case ERF_TYPE_DSM_COLOR_ETH:
485 case ERF_TYPE_COLOR_ETH:
486 case ERF_TYPE_ETH:
487 packet_len += 2; /* ETH header */
488 break;
489 } /* switch type */
490
491 /* Include ERF extension headers */
492 packet_len += (8 * num_ext_hdr);
493
494 if (caplen > packet_len) {
495 caplen = packet_len;
496 }
497 } else {
498 /* Other kind of encapsulation according to the header Type */
499
500 /* Skip over generic ERF header */
501 dp += dag_record_size;
502 /* Skip over extension headers */
503 dp += 8 * num_ext_hdr;
504
505 switch((header->type & 0x7f)) {
506 case ERF_TYPE_ATM:
507 case ERF_TYPE_AAL5:
508 if ((header->type & 0x7f) == ERF_TYPE_AAL5) {
509 packet_len = ntohs(header->wlen);
510 caplen = rlen - dag_record_size;
511 }
512 case ERF_TYPE_MC_ATM:
513 if ((header->type & 0x7f) == ERF_TYPE_MC_ATM) {
514 caplen = packet_len = ATM_CELL_SIZE;
515 dp+=4;
516 }
517 case ERF_TYPE_MC_AAL5:
518 if ((header->type & 0x7f) == ERF_TYPE_MC_AAL5) {
519 packet_len = ntohs(header->wlen);
520 caplen = rlen - dag_record_size - 4;
521 dp+=4;
522 }
523 /* Skip over extension headers */
524 caplen -= (8 * num_ext_hdr);
525
526 if ((header->type & 0x7f) == ERF_TYPE_ATM) {
527 caplen = packet_len = ATM_CELL_SIZE;
528 }
529 if (p->linktype == DLT_SUNATM) {
530 struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp;
531 unsigned long rawatm;
532
533 rawatm = ntohl(*((unsigned long *)dp));
534 sunatm->vci = htons((rawatm >> 4) & 0xffff);
535 sunatm->vpi = (rawatm >> 20) & 0x00ff;
536 sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) |
537 ((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 :
538 ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 :
539 ((dp[ATM_HDR_SIZE] == 0xaa &&
540 dp[ATM_HDR_SIZE+1] == 0xaa &&
541 dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1)));
542
543 } else if (p->linktype == DLT_ATM_RFC1483) {
544 packet_len -= ATM_HDR_SIZE;
545 caplen -= ATM_HDR_SIZE;
546 dp += ATM_HDR_SIZE;
547 } else
548 continue;
549 break;
550
551 case ERF_TYPE_COLOR_HASH_ETH:
552 case ERF_TYPE_DSM_COLOR_ETH:
553 case ERF_TYPE_COLOR_ETH:
554 case ERF_TYPE_ETH:
555 if ((p->linktype != DLT_EN10MB) &&
556 (p->linktype != DLT_DOCSIS))
557 continue;
558 packet_len = ntohs(header->wlen);
559 packet_len -= (pd->dag_fcs_bits >> 3);
560 caplen = rlen - dag_record_size - 2;
561 /* Skip over extension headers */
562 caplen -= (8 * num_ext_hdr);
563 if (caplen > packet_len) {
564 caplen = packet_len;
565 }
566 dp += 2;
567 break;
568
569 case ERF_TYPE_COLOR_HASH_POS:
570 case ERF_TYPE_DSM_COLOR_HDLC_POS:
571 case ERF_TYPE_COLOR_HDLC_POS:
572 case ERF_TYPE_HDLC_POS:
573 if ((p->linktype != DLT_CHDLC) &&
574 (p->linktype != DLT_PPP_SERIAL) &&
575 (p->linktype != DLT_FRELAY))
576 continue;
577 packet_len = ntohs(header->wlen);
578 packet_len -= (pd->dag_fcs_bits >> 3);
579 caplen = rlen - dag_record_size;
580 /* Skip over extension headers */
581 caplen -= (8 * num_ext_hdr);
582 if (caplen > packet_len) {
583 caplen = packet_len;
584 }
585 break;
586
587 case ERF_TYPE_COLOR_MC_HDLC_POS:
588 case ERF_TYPE_MC_HDLC:
589 if ((p->linktype != DLT_CHDLC) &&
590 (p->linktype != DLT_PPP_SERIAL) &&
591 (p->linktype != DLT_FRELAY) &&
592 (p->linktype != DLT_MTP2) &&
593 (p->linktype != DLT_MTP2_WITH_PHDR) &&
594 (p->linktype != DLT_LAPD))
595 continue;
596 packet_len = ntohs(header->wlen);
597 packet_len -= (pd->dag_fcs_bits >> 3);
598 caplen = rlen - dag_record_size - 4;
599 /* Skip over extension headers */
600 caplen -= (8 * num_ext_hdr);
601 if (caplen > packet_len) {
602 caplen = packet_len;
603 }
604 /* jump the MC_HDLC_HEADER */
605 dp += 4;
606 #ifdef DLT_MTP2_WITH_PHDR
607 if (p->linktype == DLT_MTP2_WITH_PHDR) {
608 /* Add the MTP2 Pseudo Header */
609 caplen += MTP2_HDR_LEN;
610 packet_len += MTP2_HDR_LEN;
611
612 TempPkt[MTP2_SENT_OFFSET] = 0;
613 TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN;
614 *(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01);
615 *(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff);
616 memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen);
617 dp = TempPkt;
618 }
619 #endif
620 break;
621
622 case ERF_TYPE_IPV4:
623 if ((p->linktype != DLT_RAW) &&
624 (p->linktype != DLT_IPV4))
625 continue;
626 packet_len = ntohs(header->wlen);
627 caplen = rlen - dag_record_size;
628 /* Skip over extension headers */
629 caplen -= (8 * num_ext_hdr);
630 if (caplen > packet_len) {
631 caplen = packet_len;
632 }
633 break;
634
635 case ERF_TYPE_IPV6:
636 if ((p->linktype != DLT_RAW) &&
637 (p->linktype != DLT_IPV6))
638 continue;
639 packet_len = ntohs(header->wlen);
640 caplen = rlen - dag_record_size;
641 /* Skip over extension headers */
642 caplen -= (8 * num_ext_hdr);
643 if (caplen > packet_len) {
644 caplen = packet_len;
645 }
646 break;
647
648 /* These types have no matching 'native' DLT, but can be used with DLT_ERF above */
649 case ERF_TYPE_MC_RAW:
650 case ERF_TYPE_MC_RAW_CHANNEL:
651 case ERF_TYPE_IP_COUNTER:
652 case ERF_TYPE_TCP_FLOW_COUNTER:
653 case ERF_TYPE_INFINIBAND:
654 case ERF_TYPE_RAW_LINK:
655 case ERF_TYPE_INFINIBAND_LINK:
656 default:
657 /* Unhandled ERF type.
658 * Ignore rather than generating error
659 */
660 continue;
661 } /* switch type */
662
663 } /* ERF encapsulation */
664
665 if (caplen > p->snapshot)
666 caplen = p->snapshot;
667
668 /* Run the packet filter if there is one. */
669 if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
670
671 /* convert between timestamp formats */
672 register unsigned long long ts;
673
674 if (IS_BIGENDIAN()) {
675 ts = SWAPLL(header->ts);
676 } else {
677 ts = header->ts;
678 }
679
680 switch (p->opt.tstamp_precision) {
681 case PCAP_TSTAMP_PRECISION_NANO:
682 ticks_per_second = 1000000000;
683 break;
684 case PCAP_TSTAMP_PRECISION_MICRO:
685 default:
686 ticks_per_second = 1000000;
687 break;
688
689 }
690 pcap_header.ts.tv_sec = ts >> 32;
691 ts = (ts & 0xffffffffULL) * ticks_per_second;
692 ts += 0x80000000; /* rounding */
693 pcap_header.ts.tv_usec = ts >> 32;
694 if (pcap_header.ts.tv_usec >= ticks_per_second) {
695 pcap_header.ts.tv_usec -= ticks_per_second;
696 pcap_header.ts.tv_sec++;
697 }
698
699 /* Fill in our own header data */
700 pcap_header.caplen = caplen;
701 pcap_header.len = packet_len;
702
703 /* Count the packet. */
704 pd->stat.ps_recv++;
705
706 /* Call the user supplied callback function */
707 callback(user, &pcap_header, dp);
708
709 /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */
710 processed++;
711 if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
712 {
713 /* Reached the user-specified limit. */
714 return cnt;
715 }
716 }
717 }
718
719 return processed;
720 }
721
722 static int
dag_inject(pcap_t * p,const void * buf _U_,size_t size _U_)723 dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
724 {
725 strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards",
726 PCAP_ERRBUF_SIZE);
727 return (-1);
728 }
729
730 /*
731 * Get a handle for a live capture from the given DAG device. Passing a NULL
732 * device will result in a failure. The promisc flag is ignored because DAG
733 * cards are always promiscuous. The to_ms parameter is used in setting the
734 * API polling parameters.
735 *
736 * snaplen is now also ignored, until we get per-stream slen support. Set
737 * slen with approprite DAG tool BEFORE pcap_activate().
738 *
739 * See also pcap(3).
740 */
dag_activate(pcap_t * p)741 static int dag_activate(pcap_t* p)
742 {
743 struct pcap_dag *pd = p->priv;
744 char *s;
745 int n;
746 daginf_t* daginf;
747 char * newDev = NULL;
748 char * device = p->opt.device;
749 dag_size_t mindata;
750 struct timeval maxwait;
751 struct timeval poll;
752
753 if (device == NULL) {
754 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "device is NULL");
755 return -1;
756 }
757
758 /* Initialize some components of the pcap structure. */
759 newDev = (char *)malloc(strlen(device) + 16);
760 if (newDev == NULL) {
761 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
762 errno, "Can't allocate string for device name");
763 goto fail;
764 }
765
766 /* Parse input name to get dag device and stream number if provided */
767 if (dag_parse_name(device, newDev, strlen(device) + 16, &pd->dag_stream) < 0) {
768 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
769 errno, "dag_parse_name");
770 goto fail;
771 }
772 device = newDev;
773
774 if (pd->dag_stream%2) {
775 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture");
776 goto fail;
777 }
778
779 /* setup device parameters */
780 if((pd->dag_ref = dag_config_init((char *)device)) == NULL) {
781 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
782 errno, "dag_config_init %s", device);
783 goto fail;
784 }
785
786 if((p->fd = dag_config_get_card_fd(pd->dag_ref)) < 0) {
787 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
788 errno, "dag_config_get_card_fd %s", device);
789 goto fail;
790 }
791
792 /* Open requested stream. Can fail if already locked or on error */
793 if (dag_attach_stream64(p->fd, pd->dag_stream, 0, 0) < 0) {
794 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
795 errno, "dag_attach_stream");
796 goto failclose;
797 }
798
799 /* Try to find Stream Drop attribute */
800 pd->drop_attr = kNullAttributeUuid;
801 pd->dag_root = dag_config_get_root_component(pd->dag_ref);
802 if ( dag_component_get_subcomponent(pd->dag_root, kComponentStreamFeatures, 0) )
803 {
804 pd->drop_attr = dag_config_get_indexed_attribute_uuid(pd->dag_ref, kUint32AttributeStreamDropCount, pd->dag_stream/2);
805 }
806
807 /* Set up default poll parameters for stream
808 * Can be overridden by pcap_set_nonblock()
809 */
810 if (dag_get_stream_poll64(p->fd, pd->dag_stream,
811 &mindata, &maxwait, &poll) < 0) {
812 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
813 errno, "dag_get_stream_poll");
814 goto faildetach;
815 }
816
817 /* Use the poll time as the required select timeout for callers
818 * who are using select()/etc. in an event loop waiting for
819 * packets to arrive.
820 */
821 pd->required_select_timeout = poll;
822 p->required_select_timeout = &pd->required_select_timeout;
823
824 /*
825 * Turn a negative snapshot value (invalid), a snapshot value of
826 * 0 (unspecified), or a value bigger than the normal maximum
827 * value, into the maximum allowed value.
828 *
829 * If some application really *needs* a bigger snapshot
830 * length, we should just increase MAXIMUM_SNAPLEN.
831 */
832 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
833 p->snapshot = MAXIMUM_SNAPLEN;
834
835 if (p->opt.immediate) {
836 /* Call callback immediately.
837 * XXX - is this the right way to p this?
838 */
839 mindata = 0;
840 } else {
841 /* Amount of data to collect in Bytes before calling callbacks.
842 * Important for efficiency, but can introduce latency
843 * at low packet rates if to_ms not set!
844 */
845 mindata = 65536;
846 }
847
848 /* Obey opt.timeout (was to_ms) if supplied. This is a good idea!
849 * Recommend 10-100ms. Calls will time out even if no data arrived.
850 */
851 maxwait.tv_sec = p->opt.timeout/1000;
852 maxwait.tv_usec = (p->opt.timeout%1000) * 1000;
853
854 if (dag_set_stream_poll64(p->fd, pd->dag_stream,
855 mindata, &maxwait, &poll) < 0) {
856 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
857 errno, "dag_set_stream_poll");
858 goto faildetach;
859 }
860
861 /* XXX Not calling dag_configure() to set slen; this is unsafe in
862 * multi-stream environments as the gpp config is global.
863 * Once the firmware provides 'per-stream slen' this can be supported
864 * again via the Config API without side-effects */
865 #if 0
866 /* set the card snap length to the specified snaplen parameter */
867 /* This is a really bad idea, as different cards have different
868 * valid slen ranges. Should fix in Config API. */
869 if (p->snapshot == 0 || p->snapshot > MAX_DAG_SNAPLEN) {
870 p->snapshot = MAX_DAG_SNAPLEN;
871 } else if (snaplen < MIN_DAG_SNAPLEN) {
872 p->snapshot = MIN_DAG_SNAPLEN;
873 }
874 /* snap len has to be a multiple of 4 */
875 #endif
876
877 if(dag_start_stream(p->fd, pd->dag_stream) < 0) {
878 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
879 errno, "dag_start_stream %s", device);
880 goto faildetach;
881 }
882
883 /*
884 * Important! You have to ensure bottom is properly
885 * initialized to zero on startup, it won't give you
886 * a compiler warning if you make this mistake!
887 */
888 pd->dag_mem_bottom = 0;
889 pd->dag_mem_top = 0;
890
891 /*
892 * Find out how many FCS bits we should strip.
893 * First, query the card to see if it strips the FCS.
894 */
895 daginf = dag_info(p->fd);
896 if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) {
897 /* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */
898 pd->dag_fcs_bits = 0;
899
900 /* Note that no FCS will be supplied. */
901 p->linktype_ext = LT_FCS_DATALINK_EXT(0);
902 } else {
903 /*
904 * Start out assuming it's 32 bits.
905 */
906 pd->dag_fcs_bits = 32;
907
908 /* Allow an environment variable to override. */
909 if ((s = getenv("ERF_FCS_BITS")) != NULL) {
910 if ((n = atoi(s)) == 0 || n == 16 || n == 32) {
911 pd->dag_fcs_bits = n;
912 } else {
913 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
914 "pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment", device, n);
915 goto failstop;
916 }
917 }
918
919 /*
920 * Did the user request that they not be stripped?
921 */
922 if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) {
923 /* Yes. Note the number of bytes that will be
924 supplied. */
925 p->linktype_ext = LT_FCS_DATALINK_EXT(pd->dag_fcs_bits/16);
926
927 /* And don't strip them. */
928 pd->dag_fcs_bits = 0;
929 }
930 }
931
932 pd->dag_timeout = p->opt.timeout;
933
934 p->linktype = -1;
935 if (dag_get_datalink(p) < 0)
936 goto failstop;
937
938 p->bufsize = 0;
939
940 if (new_pcap_dag(p) < 0) {
941 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
942 errno, "new_pcap_dag %s", device);
943 goto failstop;
944 }
945
946 /*
947 * "select()" and "poll()" don't work on DAG device descriptors.
948 */
949 p->selectable_fd = -1;
950
951 if (newDev != NULL) {
952 free((char *)newDev);
953 }
954
955 p->read_op = dag_read;
956 p->inject_op = dag_inject;
957 p->setfilter_op = dag_setfilter;
958 p->setdirection_op = NULL; /* Not implemented.*/
959 p->set_datalink_op = dag_set_datalink;
960 p->getnonblock_op = pcap_getnonblock_fd;
961 p->setnonblock_op = dag_setnonblock;
962 p->stats_op = dag_stats;
963 p->cleanup_op = dag_platform_cleanup;
964 pd->stat.ps_drop = 0;
965 pd->stat.ps_recv = 0;
966 pd->stat.ps_ifdrop = 0;
967 return 0;
968
969 failstop:
970 if (dag_stop_stream(p->fd, pd->dag_stream) < 0) {
971 fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
972 }
973
974 faildetach:
975 if (dag_detach_stream(p->fd, pd->dag_stream) < 0)
976 fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
977
978 failclose:
979 dag_config_dispose(pd->dag_ref);
980 delete_pcap_dag(p);
981
982 fail:
983 pcap_cleanup_live_common(p);
984 if (newDev != NULL) {
985 free((char *)newDev);
986 }
987
988 return PCAP_ERROR;
989 }
990
dag_create(const char * device,char * ebuf,int * is_ours)991 pcap_t *dag_create(const char *device, char *ebuf, int *is_ours)
992 {
993 const char *cp;
994 char *cpend;
995 long devnum;
996 pcap_t *p;
997 long stream = 0;
998
999 /* Does this look like a DAG device? */
1000 cp = strrchr(device, '/');
1001 if (cp == NULL)
1002 cp = device;
1003 /* Does it begin with "dag"? */
1004 if (strncmp(cp, "dag", 3) != 0) {
1005 /* Nope, doesn't begin with "dag" */
1006 *is_ours = 0;
1007 return NULL;
1008 }
1009 /* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */
1010 cp += 3;
1011 devnum = strtol(cp, &cpend, 10);
1012 if (*cpend == ':') {
1013 /* Followed by a stream number. */
1014 stream = strtol(++cpend, &cpend, 10);
1015 }
1016
1017 if (cpend == cp || *cpend != '\0') {
1018 /* Not followed by a number. */
1019 *is_ours = 0;
1020 return NULL;
1021 }
1022
1023 if (devnum < 0 || devnum >= DAG_MAX_BOARDS) {
1024 /* Followed by a non-valid number. */
1025 *is_ours = 0;
1026 return NULL;
1027 }
1028
1029 if (stream <0 || stream >= DAG_STREAM_MAX) {
1030 /* Followed by a non-valid stream number. */
1031 *is_ours = 0;
1032 return NULL;
1033 }
1034
1035 /* OK, it's probably ours. */
1036 *is_ours = 1;
1037
1038 p = pcap_create_common(ebuf, sizeof (struct pcap_dag));
1039 if (p == NULL)
1040 return NULL;
1041
1042 p->activate_op = dag_activate;
1043
1044 /*
1045 * We claim that we support microsecond and nanosecond time
1046 * stamps.
1047 *
1048 * XXX Our native precision is 2^-32s, but libpcap doesn't support
1049 * power of two precisions yet. We can convert to either MICRO or NANO.
1050 */
1051 p->tstamp_precision_count = 2;
1052 p->tstamp_precision_list = malloc(2 * sizeof(u_int));
1053 if (p->tstamp_precision_list == NULL) {
1054 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1055 errno, "malloc");
1056 pcap_close(p);
1057 return NULL;
1058 }
1059 p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
1060 p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
1061 return p;
1062 }
1063
1064 static int
dag_stats(pcap_t * p,struct pcap_stat * ps)1065 dag_stats(pcap_t *p, struct pcap_stat *ps) {
1066 struct pcap_dag *pd = p->priv;
1067 uint32_t stream_drop;
1068 dag_err_t dag_error;
1069
1070 /*
1071 * Packet records received (ps_recv) are counted in dag_read().
1072 * Packet records dropped (ps_drop) are read from Stream Drop attribute if present,
1073 * otherwise integrate the ERF Header lctr counts (if available) in dag_read().
1074 * We are reporting that no records are dropped by the card/driver (ps_ifdrop).
1075 */
1076
1077 if(pd->drop_attr != kNullAttributeUuid) {
1078 /* Note this counter is cleared at start of capture and will wrap at UINT_MAX.
1079 * The application is responsible for polling ps_drop frequently enough
1080 * to detect each wrap and integrate total drop with a wider counter */
1081 if ((dag_error = dag_config_get_uint32_attribute_ex(pd->dag_ref, pd->drop_attr, &stream_drop) == kDagErrNone)) {
1082 pd->stat.ps_drop = stream_drop;
1083 } else {
1084 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "reading stream drop attribute: %s",
1085 dag_config_strerror(dag_error));
1086 return -1;
1087 }
1088 }
1089
1090 *ps = pd->stat;
1091
1092 return 0;
1093 }
1094
1095 /*
1096 * Add all DAG devices.
1097 */
1098 int
dag_findalldevs(pcap_if_list_t * devlistp,char * errbuf)1099 dag_findalldevs(pcap_if_list_t *devlistp, char *errbuf)
1100 {
1101 char name[12]; /* XXX - pick a size */
1102 int c;
1103 char dagname[DAGNAME_BUFSIZE];
1104 int dagstream;
1105 int dagfd;
1106 dag_card_inf_t *inf;
1107 char *description;
1108 int stream, rxstreams;
1109
1110 /* Try all the DAGs 0-DAG_MAX_BOARDS */
1111 for (c = 0; c < DAG_MAX_BOARDS; c++) {
1112 pcap_snprintf(name, 12, "dag%d", c);
1113 if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream))
1114 {
1115 (void) pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1116 "dag: device name %s can't be parsed", name);
1117 return (-1);
1118 }
1119 if ( (dagfd = dag_open(dagname)) >= 0 ) {
1120 description = NULL;
1121 if ((inf = dag_pciinfo(dagfd)))
1122 description = dag_device_name(inf->device_code, 1);
1123 /*
1124 * XXX - is there a way to determine whether
1125 * the card is plugged into a network or not?
1126 * If so, we should check that and set
1127 * PCAP_IF_CONNECTION_STATUS_CONNECTED or
1128 * PCAP_IF_CONNECTION_STATUS_DISCONNECTED.
1129 *
1130 * Also, are there notions of "up" and "running"?
1131 */
1132 if (add_dev(devlistp, name, 0, description, errbuf) == NULL) {
1133 /*
1134 * Failure.
1135 */
1136 return (-1);
1137 }
1138 rxstreams = dag_rx_get_stream_count(dagfd);
1139 for(stream=0;stream<DAG_STREAM_MAX;stream+=2) {
1140 if (0 == dag_attach_stream(dagfd, stream, 0, 0)) {
1141 dag_detach_stream(dagfd, stream);
1142
1143 pcap_snprintf(name, 10, "dag%d:%d", c, stream);
1144 if (add_dev(devlistp, name, 0, description, errbuf) == NULL) {
1145 /*
1146 * Failure.
1147 */
1148 return (-1);
1149 }
1150
1151 rxstreams--;
1152 if(rxstreams <= 0) {
1153 break;
1154 }
1155 }
1156 }
1157 dag_close(dagfd);
1158 }
1159
1160 }
1161 return (0);
1162 }
1163
1164 /*
1165 * Installs the given bpf filter program in the given pcap structure. There is
1166 * no attempt to store the filter in kernel memory as that is not supported
1167 * with DAG cards.
1168 */
1169 static int
dag_setfilter(pcap_t * p,struct bpf_program * fp)1170 dag_setfilter(pcap_t *p, struct bpf_program *fp)
1171 {
1172 if (!p)
1173 return -1;
1174 if (!fp) {
1175 strncpy(p->errbuf, "setfilter: No filter specified",
1176 sizeof(p->errbuf));
1177 return -1;
1178 }
1179
1180 /* Make our private copy of the filter */
1181
1182 if (install_bpf_program(p, fp) < 0)
1183 return -1;
1184
1185 return (0);
1186 }
1187
1188 static int
dag_set_datalink(pcap_t * p,int dlt)1189 dag_set_datalink(pcap_t *p, int dlt)
1190 {
1191 p->linktype = dlt;
1192
1193 return (0);
1194 }
1195
1196 static int
dag_setnonblock(pcap_t * p,int nonblock)1197 dag_setnonblock(pcap_t *p, int nonblock)
1198 {
1199 struct pcap_dag *pd = p->priv;
1200 dag_size_t mindata;
1201 struct timeval maxwait;
1202 struct timeval poll;
1203
1204 /*
1205 * Set non-blocking mode on the FD.
1206 * XXX - is that necessary? If not, don't bother calling it,
1207 * and have a "dag_getnonblock()" function that looks at
1208 * "pd->dag_flags".
1209 */
1210 if (pcap_setnonblock_fd(p, nonblock) < 0)
1211 return (-1);
1212
1213 if (dag_get_stream_poll64(p->fd, pd->dag_stream,
1214 &mindata, &maxwait, &poll) < 0) {
1215 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
1216 errno, "dag_get_stream_poll");
1217 return -1;
1218 }
1219
1220 /* Amount of data to collect in Bytes before calling callbacks.
1221 * Important for efficiency, but can introduce latency
1222 * at low packet rates if to_ms not set!
1223 */
1224 if(nonblock)
1225 mindata = 0;
1226 else
1227 mindata = 65536;
1228
1229 if (dag_set_stream_poll64(p->fd, pd->dag_stream,
1230 mindata, &maxwait, &poll) < 0) {
1231 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
1232 errno, "dag_set_stream_poll");
1233 return -1;
1234 }
1235
1236 if (nonblock) {
1237 pd->dag_flags |= DAGF_NONBLOCK;
1238 } else {
1239 pd->dag_flags &= ~DAGF_NONBLOCK;
1240 }
1241 return (0);
1242 }
1243
1244 static int
dag_get_datalink(pcap_t * p)1245 dag_get_datalink(pcap_t *p)
1246 {
1247 struct pcap_dag *pd = p->priv;
1248 int index=0, dlt_index=0;
1249 uint8_t types[255];
1250
1251 memset(types, 0, 255);
1252
1253 if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) {
1254 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
1255 errno, "malloc");
1256 return (-1);
1257 }
1258
1259 p->linktype = 0;
1260
1261 #ifdef HAVE_DAG_GET_STREAM_ERF_TYPES
1262 /* Get list of possible ERF types for this card */
1263 if (dag_get_stream_erf_types(p->fd, pd->dag_stream, types, 255) < 0) {
1264 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
1265 errno, "dag_get_stream_erf_types");
1266 return (-1);
1267 }
1268
1269 while (types[index]) {
1270
1271 #elif defined HAVE_DAG_GET_ERF_TYPES
1272 /* Get list of possible ERF types for this card */
1273 if (dag_get_erf_types(p->fd, types, 255) < 0) {
1274 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
1275 errno, "dag_get_erf_types");
1276 return (-1);
1277 }
1278
1279 while (types[index]) {
1280 #else
1281 /* Check the type through a dagapi call. */
1282 types[index] = dag_linktype(p->fd);
1283
1284 {
1285 #endif
1286 switch((types[index] & 0x7f)) {
1287
1288 case ERF_TYPE_HDLC_POS:
1289 case ERF_TYPE_COLOR_HDLC_POS:
1290 case ERF_TYPE_DSM_COLOR_HDLC_POS:
1291 case ERF_TYPE_COLOR_HASH_POS:
1292
1293 if (p->dlt_list != NULL) {
1294 p->dlt_list[dlt_index++] = DLT_CHDLC;
1295 p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
1296 p->dlt_list[dlt_index++] = DLT_FRELAY;
1297 }
1298 if(!p->linktype)
1299 p->linktype = DLT_CHDLC;
1300 break;
1301
1302 case ERF_TYPE_ETH:
1303 case ERF_TYPE_COLOR_ETH:
1304 case ERF_TYPE_DSM_COLOR_ETH:
1305 case ERF_TYPE_COLOR_HASH_ETH:
1306 /*
1307 * This is (presumably) a real Ethernet capture; give it a
1308 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
1309 * that an application can let you choose it, in case you're
1310 * capturing DOCSIS traffic that a Cisco Cable Modem
1311 * Termination System is putting out onto an Ethernet (it
1312 * doesn't put an Ethernet header onto the wire, it puts raw
1313 * DOCSIS frames out on the wire inside the low-level
1314 * Ethernet framing).
1315 */
1316 if (p->dlt_list != NULL) {
1317 p->dlt_list[dlt_index++] = DLT_EN10MB;
1318 p->dlt_list[dlt_index++] = DLT_DOCSIS;
1319 }
1320 if(!p->linktype)
1321 p->linktype = DLT_EN10MB;
1322 break;
1323
1324 case ERF_TYPE_ATM:
1325 case ERF_TYPE_AAL5:
1326 case ERF_TYPE_MC_ATM:
1327 case ERF_TYPE_MC_AAL5:
1328 if (p->dlt_list != NULL) {
1329 p->dlt_list[dlt_index++] = DLT_ATM_RFC1483;
1330 p->dlt_list[dlt_index++] = DLT_SUNATM;
1331 }
1332 if(!p->linktype)
1333 p->linktype = DLT_ATM_RFC1483;
1334 break;
1335
1336 case ERF_TYPE_COLOR_MC_HDLC_POS:
1337 case ERF_TYPE_MC_HDLC:
1338 if (p->dlt_list != NULL) {
1339 p->dlt_list[dlt_index++] = DLT_CHDLC;
1340 p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
1341 p->dlt_list[dlt_index++] = DLT_FRELAY;
1342 p->dlt_list[dlt_index++] = DLT_MTP2;
1343 p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR;
1344 p->dlt_list[dlt_index++] = DLT_LAPD;
1345 }
1346 if(!p->linktype)
1347 p->linktype = DLT_CHDLC;
1348 break;
1349
1350 case ERF_TYPE_IPV4:
1351 if (p->dlt_list != NULL) {
1352 p->dlt_list[dlt_index++] = DLT_RAW;
1353 p->dlt_list[dlt_index++] = DLT_IPV4;
1354 }
1355 if(!p->linktype)
1356 p->linktype = DLT_RAW;
1357 break;
1358
1359 case ERF_TYPE_IPV6:
1360 if (p->dlt_list != NULL) {
1361 p->dlt_list[dlt_index++] = DLT_RAW;
1362 p->dlt_list[dlt_index++] = DLT_IPV6;
1363 }
1364 if(!p->linktype)
1365 p->linktype = DLT_RAW;
1366 break;
1367
1368 case ERF_TYPE_LEGACY:
1369 case ERF_TYPE_MC_RAW:
1370 case ERF_TYPE_MC_RAW_CHANNEL:
1371 case ERF_TYPE_IP_COUNTER:
1372 case ERF_TYPE_TCP_FLOW_COUNTER:
1373 case ERF_TYPE_INFINIBAND:
1374 case ERF_TYPE_RAW_LINK:
1375 case ERF_TYPE_INFINIBAND_LINK:
1376 case ERF_TYPE_META:
1377 default:
1378 /* Libpcap cannot deal with these types yet */
1379 /* Add no 'native' DLTs, but still covered by DLT_ERF */
1380 break;
1381
1382 } /* switch */
1383 index++;
1384 }
1385
1386 p->dlt_list[dlt_index++] = DLT_ERF;
1387
1388 p->dlt_count = dlt_index;
1389
1390 if(!p->linktype)
1391 p->linktype = DLT_ERF;
1392
1393 return p->linktype;
1394 }
1395
1396 #ifdef DAG_ONLY
1397 /*
1398 * This libpcap build supports only DAG cards, not regular network
1399 * interfaces.
1400 */
1401
1402 /*
1403 * There are no regular interfaces, just DAG interfaces.
1404 */
1405 int
1406 pcap_platform_finddevs(pcap_if_list_t *devlistp _U_, char *errbuf)
1407 {
1408 return (0);
1409 }
1410
1411 /*
1412 * Attempts to open a regular interface fail.
1413 */
1414 pcap_t *
1415 pcap_create_interface(const char *device, char *errbuf)
1416 {
1417 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1418 "This version of libpcap only supports DAG cards");
1419 return NULL;
1420 }
1421
1422 /*
1423 * Libpcap version string.
1424 */
1425 const char *
1426 pcap_lib_version(void)
1427 {
1428 return (PCAP_VERSION_STRING " (DAG-only)");
1429 }
1430 #endif
1431